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<script type='text/javascript'>
window.onload = function()
{
  initCheckBehavior();
}
function initCheckBehavior()
{
  var i, a;

  for (i = 0; i < document.links.length; ++i) {
    a = document.links[i];
    if (a.id.indexOf('UncheckAll_') != -1) {
      a.onclick = doCheckBehavior;
      a._CBNAME_ = a.id.substr(11) + '[]';
      a._CBCHECKED_ = false;
    }
    else if (a.id.indexOf('CheckAll_') != -1) {
      a.onclick = doCheckBehavior;
      a._CBNAME_ = a.id.substr(9) + '[]';
      a._CBCHECKED_ = true;
    }
  }
}
function doCheckBehavior()
{
  var i, cb = document.getElementsByName(this._CBNAME_);
  for (i = 0; i < cb.length; ++i) {
    cb[i].checked = this._CBCHECKED_;
  }
  return false;
}
</script>

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<form action='#' method='post' name='form1'>
<input type='checkbox' name='cb1[]' value='cb1 1'>
<input type='checkbox' name='cb1[]' value='cb1 2'>
<input type='checkbox' name='cb1[]' value='cb1 3'>
<input type='checkbox' name='cb1[]' value='cb1 4'>
<input type='checkbox' name='cb1[]' value='cb1 5'>
<a id='CheckAll_cb1' href=''>Check All</a> | <a id='UncheckAll_cb1' href=''>Uncheck All</a></p>